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Mobile innovation isn't just on show at the Fira Gran Via conference center -- there are dozens of fringe events, parties and pitches taking place in Barcelona this week as well.
Last night one of them, the exclusive Bubble over Barcelona TechCrunch party, saw indie developers Inpris win the pitch competition with a "sightless keyboard" that enables visually impaired mobile users to use braille typing patterns and audio feedback to type on a touch screen.
Accessibility continues to be another big trend this year. Runners up were Zighra -- mobile security company which uses human kinetics to replace passwords. Their mobile app plugin learns a user's physical patterns of holding and using their phone to provide an extra layer of protection for your devices.
PayPal has done a pretty amazing job of changing the way we pay for things online. It has successfully challenged the Visa/MasterCard payment flow for web payments (though it still runs on their "rails" of course).
But what it really wants to do is get big in the offline world. Or the main street, as you or I might call it.
Over the last year it's tried loads of ideas, from barcode payments to card readers (that a retailer plugs into their phone) to "pay with your face" -- basically, you sign in to your app and the shop assistant just verifies it's you and then takes the payment).
At MWC PayPal has upped the ante again. On Sunday it confirmed an app for the new Gear watch so you can now also pay from your wrist. It also announced another partnership with Samsung on the Galaxy S5 to let users pay for items password-free with a fingerprint.
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"He talked about their telecoms set up in the Philippines and using Facebook to incentivize and teach people to pay for data but Facebook has actually been running that for a while and there was no talk about how it's going which leads me to think it's not going that well."
Samsung Galaxy S5 (L), Samsung Galaxy Gear 2 (C) and Samsung Galaxy Fit (R) are presented during the 2014 Mobile World Congress in Barcelona, Spain. Image credit: Lluis Gene/AFP/Getty Images
About Mobile World Congress
Mobile World Congress, in Barcelona, Spain, is the world's largest mobile phone trade show. It aims to celebrate the current state of mobile and offer a glimpse into where mobile might go next.
CNN will be at the event, bringing you all the latest news on the ground.
Plus, follow the buzz on Twitter at #MWC14 and keep up with the latest with our liveblog and Mobile World Congress twitter list.